Table 1
Spectroscopic parameters of the rotational transitions of CH2 studied in this work.
| Transition | Frequency | AE | Sij | Eu | |
|---|---|---|---|---|---|
| J′− J′′ | F′− F′′ | [MHz] | 1 × 10−6 [s−1] | [K] | |
 (para-CH2) |
|||||
| 3−4 | – | 444825.666 | 59.8 | 0.928 | 155.97 |
| 2−3 | – | 439960.991 | 64.3 | 1.353 | 156.27 |
| 1−2 | – | 444913.930 | 70.1 | 0.631 | 155.85 |
 = 404−313 (ortho-CH2) |
|||||
| 5−4 | 6−5 | 68371.278 | 0.216 | 2.329 | |
| 5−4 | 68375.875 (**) | 0.208 | 1.892 | 224.22 | |
| 4−3 | 68380.873 | 0.206 | 1.533 | ||
| 4−3 | 3−2 | 70678.633 | 0.214 | 1.077 | |
| 4−3 | 70679.543 (**) | 0.210 | 1.413 | 224.76 | |
| 5−4 | 70680.720 | 0.223 | 1.842 | ||
| 3−2 | 2−1 | 69007.179 | 0.171 | 0.691 | |
| 3−2 | 69014.202 (**) | 0.181 | 1.023 | 224.15 | |
| 4−3 | 69019.187 | 0.204 | 1.480 | ||
Notes. The spectroscopic data – frequencies, Einstein A-coefficients (AE) and line strengths (Sij) were taken from Ozeki & Saito (1995) and the Cologne Database for Molecular Spectroscopy (Müller et al. 2005). (**) Indicates the central HFS transition, which was used to set the velocity scale in the analysis.
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